Inter-Sector Interference Control via OSI Reports
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Solution Overview
Problem
Wireless communication systems face interference issues due to non-orthogonal transmissions from multiple terminals, degrading performance and requiring effective interference control mechanisms.
Innovation Solution
The system estimates inter-sector interference and generates reports to regulate data transmissions, allowing sectors to control admission, scheduling, and power adjustments to mitigate interference, using both user-based and network-based interference control methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminals simultaneously transmit data on the reverse link, then system capacity and productivity are improved, but inter-sector interference increases degrading terminal performance
Solution Approach 1:
The patent implements feedback mechanisms where base stations exchange interference information with neighboring base stations through IS OSI reports. Each base station measures inter-sector interference, generates reports containing interference estimates, and uses this feedback to adjust terminal transmissions, thereby resolving the contradiction between system capacity and interference.
Solution Approach 2:
The patent changes transmission parameters dynamically by adjusting terminal transmit power levels and scheduling decisions based on real-time interference measurements. The system modifies power levels and admission control parameters to optimize the balance between productivity and interference reduction.
2Reliability
If transmit power is increased to improve signal strength, then communication reliability is improved, but inter-sector interference increases
Solution Approach 1:
The patent applies local quality by differentiating power control strategies for different terminals based on their specific interference characteristics and channel conditions. Each terminal receives customized power control commands (TPC) adjusted to its local requirements, allowing reliable communication while minimizing its specific interference contribution to neighboring sectors.
Solution Approach 2:
The system dynamically adjusts transmit power levels based on real-time interference measurements and channel conditions. Power control is not static but continuously adapted through feedback loops that monitor interference levels and adjust power commands accordingly, balancing reliability and interference generation.
3Object-affected harmful factors
If interference control measures are implemented, then inter-sector interference is reduced, but system complexity increases due to additional measurement and coordination requirements
Solution Approach 1:
The patent implements self-service by enabling base stations to autonomously measure, report, and respond to interference conditions without requiring centralized control. Each base station independently generates IS OSI reports and executes local power control decisions, reducing the complexity burden on centralized systems while effectively managing interference.
4Object-generated harmful factors
If power control commands are applied to reduce interference, then inter-sector interference is reduced, but terminal performance may be degraded if power is reduced too much
Solution Approach 1:
The patent applies partial action by implementing incremental and proportional power adjustments rather than extreme reductions. Power control commands are calibrated to achieve sufficient interference reduction while maintaining terminal performance, avoiding excessive power reduction that would degrade communication quality.
Data Source
AI summary
For interference control, a sector m estimates interference observed from terminals in neighbor sectors and obtains an interference estimate. Sector m may generate an over-the-air (OTA) other-sector interference (OSI) report and/or an inter-sector (IS) OSI report based on the interference estimate. Sector m may send the IS OSI report to the neighbor sectors, receive IS OSI reports from the neighbor sectors, and regulate data transmissions for terminals in sector m based on the received IS OSI reports. Sector m may control admission of terminals to sector m, de-assign admitted terminals, schedule terminals in sector m in a manner to reduce interference to the neighbor sectors, and/or assign the terminals in sector m with traffic channels that cause less interference to the neighbor sectors.